Dipper tooth



May 11 1926. 1,584,052

, L. w. VAN BUSKIRK DIPPER TOOTH Filed August 9, 1924 1 i V j ii an too 5 1%M4/Y505/MP/f,

a ftoz new Patented May 11, 1926.

UNITED. STATES,

1,584,052 PATENT "OFFICE.

LESEEltW. VAN'BUSKIR K, OF CLINTON, NEW JERSEY.

DIPPER TOOTH.

Application filed August 9, 1924. Serial No. 731,090.

point and base. Under this practice the base has its maximum cross-sectional dimension at the nose which is bifurcated to receive the web of the point and is otherwise weakened due to the necessity of providing substantially uniform metal sections to meet the exigencies of heat treatment. The metal removed from the nose is put in the point, but however in its digging portion. points, therefore, sufi'er the disadvantage of comparatively short life and the scrapping of a large amount of'valuable metal.

One object of my invention is to reduce the amount of scrap metal by a substantial reversal of former conditions, that it to say, by eliminatin metal in the point and restoring metal to t 1e base, this being sound practice since a base ordinarily will outlive a great many points. A further object of the ,invention'is to provide a base the nose of which is constructed as actually to be capab'le of performing some of the functions of the usual points, thus necessitating only the addition of a comparatively small im pact element or digging tip. Another object is' to provide for building up or strengthening the crown of the nose ofthe base, with due regard to coring so as to 31-0- vide for uniform heat treatment. Another object is to provide for effectively securing the tip to'the base and for establishing a symmetrical relationship thereof. Other objects, as well as the nature, characteristic features, and scope of the invention will appear and will be more readily understood from the following description, taken in connection with the accompanying drawings, forming a part hereof, wherein,

Figure 1 is a plan view of a. sectional dipper tooth em'bodying features of my invention,

Figure 2 is an elevational view thereof, Figure 3 is a longitudinal sectional view, Figure 4 is a section on line 44 of Figure 3, and

Figure -5 is a perspective view of the tip.

Such

According to my invention; the base 5, which otherwise may be as usual, is formed with a nose 6 of considerable length and constructed on point lines so as to actually hear some of the brunt-of digging. The digging nose 6 is complete and ready for service upon the application of a compar. tively small impact element or digging tip 7. The latter is of edge form and has jaws 8 joined by a web 9. The latter is extended to" form a shank '9', whose. longitudinal edges are substantially parallel although they may taper rearwardly. v

The point body or nose 6 is vertically split or bifurcated, as at 10, just enough to take the web 9 and is thence continued in the form of a box section cavity 11 which provides a snughousing for the shank 9. This construction and arrangement is important for the reason that withoutthe bifurcated area. the box section in service is liable to I be distorted and to be opened up. The presence of'the short bifurcated area removes this liability in that it takes the greater part of the digging strain both laterally and longitudinally. I

Provision is made, as at 12 and.13, for the reception of the usual taper 10 to tighten the tip on the point base.

Immediately in back of the box section cavity 11 and which may in fact open thereinto is a cored area 14 of, substantially crescent form,-the horns of the crescent being directed axially of the upper and lower arms. of the base. The purpose ofv the cored area 14 is to provide for uniform heat treatment of the increase of metal afforded by this construction and to provide for reinforcing the crown region 15 of the base which or =dinarily is inherently weak.

The point body--01 wedge shape. nose 6, working in conjunction with the two parallel surfaces on a plane with lines H and 7 d secure the-tip or impact element against vertical movement ordinarily due to stresses and strains encountered in straight digging,

while the surface along the lines a b and a: y in conjunction with the bifurcated porv tion 10 secure the tip against lateral movement. Hence, there will be nospreading oi the wings 16, which are of small extent anyhow, and are further insured against spreading by the great depth of the shank 9 and its nice fit in the rectangular pocket or.

cavity 11.

-.The surfaces'a-c and M should be substantially parallel to the axis of the point as otherwise it would be necessary to reduce the shank 9 as it approaches the line ad;

to the axial line of the point.

It will be. manifest to those skilled in the art that I have effectively solved the problem of digging teeth, by building up the nose of the base so that it will carry most of the burden of digging and by providing an impact element or tip, which will eflectively arm the base, and the discarding of which when worn will entail very little scrapping. The fact that the tip is reversible in the same manner as the ordinary point means thatit will web.

Having this described my invention, what I claim as new, is:

A dipper tooth embodying a base for application to a dipper and whereof the portion which normally extends beyond the dipper is of box section with a cross slot at the front and with a branched core in the maximum development of the structure, and avreversible cutting bit having V clefts to fit the end walls of the cross slot and having a deep anchoring portion to prevent spreading 01 the walls under changing direction of digging stress.

wear practically down to the In testimony whereof I afiix my signature,

LESHER w, VAN BUSKIRK. 

